package com.xly.erp.common.security;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;

public final class SecurityContextHelper {

    private SecurityContextHelper() {
    }

    public static String currentUserNo() {
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
        if (auth == null || auth.getPrincipal() == null) {
            return null;
        }
        Object p = auth.getPrincipal();
        return p instanceof String s ? s : null;
    }
}